For baptistery tanks, one method for heating them is called an immersion unit. One of the main benefits to this approach is that it’s completely portable. This approach to heating the tank has been used by churches for quite some time now. They come in a variety of different shapes, but some of the most common include those that are shaped like an “I” or one that’s shaped like a “T.”

You can get them for 110 v or 240 volt plugs. Many of them have the GCFI built in, but some don’t. You can also get units that have a thermostat on them in order to change the temperature of the pool to the temperature where you want it over a period of some amount of time.

Essentially, they work by immersing them in the tank and then plugging them in. You then set the thermostat to the temperature you want, and internal heating coils change electricity into heat and cause the device to become hot enough to heat the surrounding water.

Obviously this is going to have the effect of heating the area right around the heater more quickly than the areas that are further out, which is why many churches elect to have multiple immersion units depending on the size of the tank.

Many baptistery areas are quite deep so that the preacher and the person being baptized can stand and be up to at least their waists or so. This is an important part of many of the ceremonies, after all. The problem with immersion heater units is that they aren’t as heavy duty as other models and many of them can take a long amount of time in order to really get the water into the temperature range where you want it.

It also doesn’t tend to create a current or be as compatible with filtration as other methods as well. This is because of the fact that the other way of doing this is a circulation heater which actively moves the water around. Immersion units have to rely on heating the water right around the unit and then have that heat move into the water further out and so on. As a result, this often means that the water temperature is going to be extremely uneven between the various different parts of the pool. This can be uncomfortable for people using the baptistery since there’s going to be a narrow window between areas where the pool is too hot and areas where it’s far too cold.

Church Water Heaters

One common way to heat the overall church is with a water heat through an electric system. Essentially this means that the church takes electricity the grid and converts it into heat inside of a huge tank of water. This heater will then distribute the water through a pump or other means to water pipes located in strategic areas throughout the church.

The hot water will diffuse its heat into the air, warming it to a comfortable level, and then the now cold water will flow back into the heater where it can be heated up again and then the entire process will repeat with the cool water being heated and transferred back into the heating pipes throughout the church.
The advantage of this approach is that it doesn’t require any extra resources like oil or gas..